I running two systems with a picoPSU-90 and 72W AC adapter. One is a i3-2100 with 1 SSD, 1 2.5" HDD and ODD. The other is a G620 with the same. I have a picoPSU 120 with 60W AC adapter running an H55/i3-540 with 750GB WD Green drive and ODD. I've never seen any of them go over 50W measure via Kill-A-Watt.